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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9306f8667157c357225a9080290e54639a8869c1b460715f947f0a9c5f14da1' 
  AND token = 'ZvIww4WXTrG6sO2OsF6bxliibJG3gZmng4TUeY3pCHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}